This paper is concerned with the deck replacement of the 670 m (2200 ft) long approach viaduct to Lions' Gate Suspension Bridge in Vancouver, Canada, which was carried out during night closures without affecting peak daytime commuter traffic flows. The structure was built in 1938 and comprised a series of steel plate girder spans supported on steel bents and with a 0.18 m (7 in.) reinforced concrete deck without wearing surface. Under the cumulative effects of road salt and traffic for 35 years, the deck was cracked through in places and the rebar was heavily corroded, resulting in surface spalling and potholes. The support steel had suffered some section loss from corrosion and also corrosion buckling in thin cover plates over long rivet spacings. A solution was required with would reduce the load in the support steel, cut down the corrosion rate, permit wider lanes and a wearing surface, all under the constraint of maintaining the bridge open for daily commuter traffic. This paper discusses the unusual design concepts adopted to satisfy these requirements and explains how they were realized in practice by careful attention to detail in every aspect of the job. Methods used to alert the bridge users to closures and estimated opening times are discussed together with emergency plans in the event of failure to complete a section on time. /Author/

Media Info

  • Media Type: Print
  • Features: Figures;
  • Pagination: pp 77-79
  • Monograph Title: Bridge Engineering. Volume 1
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00183749
  • Record Type: Publication
  • ISBN: 0309026962
  • Files: TRIS, TRB
  • Created Date: Dec 3 1978 12:00AM